A coil for transfer of information or energy is described. The coil includes an electrically conductive magnetically insulative first layer and a magnetically conductive second layer bonded to the first layer along the length of the first layer. The first and second layers are wound to form a plurality of substantially concentric loops. A width and a length of the second layer may be substantially co-extensive with a respective width and length of the first layer so as to expose opposing longitudinal edge surfaces of the first layer along the length of the first layer. At least one of the opposing longitudinal edge surfaces may include a regular pattern extending substantially along a same first direction and across substantially the entire coil. A method of making the coil is described.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The coil of claim 1, wherein the regular pattern has a first average pitch in a first region of the plurality of substantially concentric loops and a different second average pitch in a different second region of the plurality of substantially concentric loops.
3. The antenna of claim 1, wherein a Fourier transform of the regular pattern has a peak at a first spatial frequency in a first region of the plurality of substantially concentric loops and a peak at a different second spatial frequency in a different second region of the plurality of substantially concentric loops.
4. The antenna of claim 1, wherein the electrically conductive magnetically insulative first layer has a relative permeability of less than 1.4 and the magnetically conductive second layer has a relative permeability of greater than 10.
6. The coil of claim 5, wherein the regular pattern has a first average pitch in a first region of the coil and a different second average pitch in a different second region of the coil.
7. The coil of claim 5, wherein a Fourier transform of the regular pattern has a peak at a first spatial frequency in a first region of the coil and a peak at a different second spatial frequency in a different second region of the coil.
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August 28, 2019
May 30, 2023
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